Anthropologie Pandora Tumbler - Sold as Set - 2 Tumblers - Unbreakable!!

I’ve bought these cups from Anthropologie which are currently sold out. They are brown and cream on the inside. I have never ever used them although there is a black mark inside one of them and that is how it came. Selling both for $15. Originally $10 each! I’m not sure what they are made of, but it’s definitely a high-quality plastic so great for the pool!